/******************************

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <iostream>
//for setw, precision()
#include <iomanip>
using namespace std;

//Cau 1
char *layTrai(char *nguon, int n, int so)
{
	char *ketqua;
	if (so >= n)
	{
		return nguon;
	}
	for(int i=0; i<so; i++){
		ketqua[i] = nguon[i];
	}
	
	return ketqua;
}

char *left(char *st, int n){
	if (n >strlen(st))
	{
		return st;
	}
	char *s;
	for (int i = 0; i < n; i++)
	{
		s[i] =st[i];
	}
	return s;
}
//Cau 2

void main(){
	getch();
}

/**********************************/